.\"	$OpenBSD: ERR_GET_LIB.3,v 1.7 2018/03/27 17:35:50 schwarze Exp $
.\"	OpenSSL doc/man3/ERR_GET_LIB.pod 3dfda1a6 Dec 12 11:14:40 2016 -0500
.\"
.\" This file was written by Ulf Moeller <ulf@openssl.org>.
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.Dd $Mdocdate: March 27 2018 $
.Dt ERR_GET_LIB 3
.Os
.Sh NAME
.Nm ERR_GET_LIB ,
.Nm ERR_GET_FUNC ,
.Nm ERR_GET_REASON ,
.Nm ERR_FATAL_ERROR
.Nd get library, function and reason codes for OpenSSL errors
.Sh SYNOPSIS
.In openssl/err.h
.Ft int
.Fo ERR_GET_LIB
.Fa "unsigned long e"
.Fc
.Ft int
.Fo ERR_GET_FUNC
.Fa "unsigned long e"
.Fc
.Ft int
.Fo ERR_GET_REASON
.Fa "unsigned long e"
.Fc
.Ft int
.Fo ERR_FATAL_ERROR
.Fa "unsigned long e"
.Fc
.Sh DESCRIPTION
The error code returned by
.Xr ERR_get_error 3
consists of a library number, function code, and reason code.
.Fn ERR_GET_LIB ,
.Fn ERR_GET_FUNC ,
and
.Fn ERR_GET_REASON
can be used to extract these.
.Pp
The library number and function code describe where the error occurred,
whereas the reason code is the information about what went wrong.
.Pp
Each sub-library of OpenSSL has a unique library number; function and
reason codes are unique within each sub-library.
Note that different libraries may use the same value to signal different
functions and reasons.
.Pp
.Dv ERR_R_*
reason codes such as
.Dv ERR_R_MALLOC_FAILURE
are globally unique.
However, when checking for sub-library specific reason codes, be sure to
also compare the library number.
.Pp
.Fn ERR_FATAL_ERROR
indicates whether a given error code is a fatal error.
.Pp
These functions are implemented as macros.
.Sh RETURN VALUES
.Fn ERR_GET_LIB ,
.Fn ERR_GET_FUNC ,
and
.Fn ERR_GET_REASON
return the library number, function code, and reason code, respectively.
.Pp
.Fn ERR_FATAL_ERROR
returns non-zero if the error is fatal or 0 otherwise.
.Sh SEE ALSO
.Xr ERR 3 ,
.Xr ERR_get_error 3
.Sh HISTORY
.Fn ERR_GET_LIB ,
.Fn ERR_GET_FUNC ,
.Fn ERR_GET_REASON ,
and
.Fn ERR_FATAL_ERROR
first appeared in SSLeay 0.4.4 and have been available since
.Ox 2.4 .
